Burner and drum for blue flame oil stoves



3 Sheets-Sheet 1 Nov. 10, i936. R. HOFFMAN l BURNER AND DRUM FOR BUE FLAME OIL STOVES Filed April 1B, 1934 Nov 10, 1936.

R. HOFFMAN 2,060,317

BURNER AND DRUM FOR BLUE FLAME OIL `STOVES Filed April 18, 1934 3 Sheets-Sheet R. HOFFMAN BURNER AND DRUM. FORl BLUE FLAME oIL sTovEs Nov. 1o, 1936.

Filed April 18, 1934 a; sheef'ysheet s Patented Nov. 10, 1936 UNITED STATES PATENT OFFICE BURNER AND DRUM FOR BLUE FLAME OIL STOVES Application April 18, 1934, Serial No. 721,231

2 Claims.

This invention relates to improvements in burners and drums for blue flame oil stoves.

'Ihe primary object of the present invention is to provide an outer drum for loil stoves with an 5 opening through which the operator may see the blue ame and be enabled thereby to regulate the height of the llame.

This may be done in the several manners described hereinafter without departing from the primary invention.

The present improvement is to provide an opening in the drum, the opening being so located and so constructed that the flame of the burner is visible when the top of said flame is below the top of the chimney to prevent it from being extinguished and to assist in regulation of the flame to the desired height for the purpose of cooking or heating, as may be desired.

I desire it understood that the present improvement may be used either in a stove for cooking purposes or in a stove that is utilized for heating purposes.

The particular type of burner here shown is the form which consists of inner and outer perl forate Walls and the flame is between the walls.

In the accompanying drawings:

Figure 1 is a vertical central sectional view of a burner having the present improvement applied thereto.

Fig. 2 is an outside elevation of the drum which is provided with an opening through which the flame is visible to the operator.

Fig. 3 is a horizontal sectional view on the line 3-3 of Figure 1.

Figure 4 is a perspective view showing one form of support for the transparent wall and a section of the outer wall having an opening to which the improvement is applied.

Fig. 5 is a vertical sectional view of the drum with the transparent wall taken centrally through the opening made in the Wall.

Fig. 6 is a horizontal section of Figure 5 taken on the line 6 6.

Fig. '7 is a horizontal section taken through the drum I I showing a modified construction for supporting the glass.

Fig. 8 is a front elevation of Figure 9.

Fig. 9 is a vertical section taken centrally through the opening in the drum.

5o This invention is applied to burners for either cooking or heating purp-oses. The burners as here shown is utilized as a cooking burner. I will rst describe the preferred form of the invention. The upper part 2 of the stove frame I is provided 55 with the usual grid or grate portion 3 which supports any form of cooking utensil placed thereon. The burner has the ordinary form of wick sleeves 4, which in the form oi burner here shown are annular and consists of an outer and an inner annular sleeve which are located a sufficient dis- 5 tance apart to accommodate a wick 5. This wick is vertically adjustable by means of an ordinary spur or other wheel 5 which extends inward through an opening in the outer sleeve 4 to engage a usual wick enclosing sleeve I which also l0v L-shaped sleeve portions 8 forming flanges and 20v the inner and outer perforated chimneys 9 and I0 are located between the upwardly extending wick and the vertical portions of the L-shaped flanges as shown. It is also Well known, though not here shown, that the inner and outer per- 25y forated chimneys 9 and I0 are connected together and are removable together from the said Wick sleeve portions 4.

It is well known and well understood by those skilled in this art that when the burner is in op- 30` eration the blue flame extending between the perforated chimneys 9 and I0 clearly shows inwardly extending globular-like portions and these portions of the flame should be approximately blue when the burner is in proper operation. difficult to observe the ame between these chimneys and especially when the burner is located in a frame as here shown which makes the problem more difficult than it otherwise would be. The burner is provided with an annular drum I I which 40 surrounds the said perforated chimneys.

In carrying out the present invention I provide the drum I I with a vertical opening I2. 'I'his vertical opening is preferably in the form shown in Figures 2 and 4. It is common to provide the 45 drum II with a handle I3 for the purpose of handling the said drum. I have heretofore stated that the two perforated chimneys are attached together and will state also that the Idrum is attached to the said chimneys. This attachment usually consists in passing rods I4 through the said perforated chimneys and also the drum whereby they are attached and removable together. These rods usually extend at right angles to each other and one is placed in a horizontal It iS 35v plane below the other. By reason of these connecting rods the said chimneys and the said drum are removable so that the operator can lift them for exposing the wick for lighting or other purposes. As shown, there is a flange I5 which extends around the opening I2 of the drum II and a piece of glass I2 is supported against the inner edge of the flange I5. There is provided as shown in Figures 2, 3, and 4 of the drawings, U-shaped arms I6 that have their inner portions Il attached to the outer edge of the flange I5 or these arms may be attached directly to the said drum. The inner ends of these arms I6 are turned inward as shown at I8 and hold the glass I2 vertically in position against the inner edge of said flange I5. For the purpose of holding the said glass from sliding horizontally and holding it in proper position to close the said opening I 2 there is provided two horizontal arms I9 which extend from the outer edg-e of the flange i5, as shown in Figure 4, or these arms may be attached directly to the drum portion II. The inner ends 20 of these arms I9 are bent inwardly as shown in Figure 4. From the foregoing it will be observed that the glass I2 is held against the inner edge of the surrounding flange I5 and it closes the inner end of the opening I2. The lower end of th-e drum II has an inwardly extending annular member 2i which is provided with a series of air openings 22 through which air flows upward through the drum.

From the foregoing described construction it will be observed that the said flange I5 and the glass I 2 form a housing for the said opening and the glass is located adjacent to the openings in the outer perforated chimney I. By reason of the arrangement just described the glass is near the outer perforated chimney I0 and it is found in operation that all reflections are cut out so that the operator can clearly see the color of the flame or globules through the perforations in the outer chimney I0. By placing the handle in the relation explained in respect to the opening I2 there is a balanced appearance with no mechanical disadvantage and the handle serves in a Way to protect the said glass I2. Attention is directed to the fact that preferably the opening is made wider than the said handle which aids in the observation of the flame through the said opening. It is clear from the foregoing description that the flange I5 extends entirely around the opening I2 and that the transparent wall I2 rests against the inner edge of the said flange, thus placing the said transparent wall between the outer perforated tube IQ and the surrounding drum II. This naturally forms what might be termed a depressed box or housing and it naturally cuts out many reflections that are clearly visible where the said transparent wall is ush with the outer side of the drum I I. However, applicants novelty resides in forming an opening in the outer drum and attaching and building an inwardly extending housing around the said opening which applicant believes has never been done in this art before. This construction aside from cutting out many of the reflections does not in any manner affect the flow of air to the perforations in the outer perforated drum, which applicant believes to be another novel feature.

I have thus far described one means for supporting the said glass. However there are various other Ways. For instance in Figures 5 and 6 it will be observed that the flange I5 is present as in Figure 4 and there is provided Z-shaped members 23 arranged vertically at opposite sides of the said flange. The inner ends of these Z-shaped members 23 are provided with inwardly extending portions 24 which engage the inner side of the said glass I2 and hold the outer side of the glass in engagement with the inner edge of the flange I 5. In this construction it will be observed that the glass I 2 is made longer than it is in Figure 4 and the lower end 25 of the glass rests on the upwardly extending end 26 of the member 2| and holds the said glass in position. I'he upper end 21 of the glass is in a line with an inwardly extending annular flange 28 located at the upper end of the drum. The glass can be placed in positon or removed or replaced by the bending outwardly of one of the arms 24.

I have here shown the preferred constructions for carrying out the present improvement, but I wish it understood that these may be varied without departing from the present invention so long as they are within a reasonable interpretation of the appended claims.

Another modification of the means for holding the glass I2 is shown in Figures 9, l0 and 1l.

In this case the glass or transparent wall I2 extends throughout the length of the drum and its lower end rests on an inwardly extending flange 25', which is the equivalent of the flange 26 hereinbefore described. In this modification the upper end of the glass I2 is substantially in engagement with the annular flange 28. The housing, so to speak, in this event for assisting in holding the glass I2 consists of an inwardly extending vertical flange a located at each side of the opening i 2 and these flanges are provided with inwardly extending lips b which are located at the inner and outer sides of the glass I2.

I claim:

l. In a burner the combination of a pair of parallel vertically extending perforated combustion tubes, means located between their lower ends for producing a flame, a single vertically arranged drum surrounding the said tubes and spaced apart therefrom, said drum being provided with a vertically arranged opening, a flange surrounding said opening and narrower than the space between the said drum and the outer combustion tube and extending inwardly from the said opening, said flange having its outer edge located against the drum and its inner edge stopping at a point midway between the drum and the outer combustion tube, and a vertical transparent wall located against the inner edge of said flange and serving together with the said flange to form an imperforate inwardly extending housing.

2. In a burner, the combination of parallel vertically extending perforated combustion tubes, means located between the lower ends of the tubes for producing a flame between them, a vertical drum surrounding said perforated combustion tubes, said vertical drum being provided with a vertically arranged opening, an inwardly extending flange surrounding said opening located between said drum and the outer combustion tube, and a vertical transparent wall supported at the inner edge of said vertically extending flange, said transparent wall positioned between said vertical drum and the outer perforated combustion tube.

RUDOLPH HOFFMAN. 

